feat: add webpush and sadhna tracker

lib/sadhna.ts

@@ -91,6 +91,29 @@ export type SadhnaDashboard = {
   // plus an in-progress fold for an unfinished today. Capped server-side;
   // current_streak holds the true length.
   vine_days: VineDay[];
+  // Rewards. `next_reward_date` is the projected UTC date (YYYY-MM-DD) of the
+  // next gift if the streak continues. `pending_reward` is a freshly earned
+  // gift to celebrate now (null when there's nothing to show).
+  next_reward_date: string | null;
+  pending_reward: SadhnaRewardGrant | null;
+};
+
+/** A gift item in the streak-reward catalog. */
+export type SadhnaReward = {
+  id: string;
+  key: string;
+  name: string;
+  meaning: string;
+  image_url: string;
+  active: boolean;
+  sort: number;
+};
+
+/** A reward earned at a streak milestone (a multiple of 7 days). */
+export type SadhnaRewardGrant = {
+  milestone: number;
+  granted_at: string;
+  reward: SadhnaReward;
 };
 
 // ─── API ───────────────────────────────────────────────────────────────
@@ -99,10 +122,41 @@ export const sadhna = {
   /** Today's progress + streak + plant state. */
   dashboard: () => call<SadhnaDashboard>("/sadhna/dashboard"),
 
+  /** Per-day state for an inclusive UTC date range (YYYY-MM-DD), for the
+   *  calendar's week/month views. Range is bounded to a year server-side. */
+  history: (from: string, to: string) =>
+    call<SadhnaDay[]>(
+      `/sadhna/history?from=${encodeURIComponent(from)}&to=${encodeURIComponent(to)}`,
+    ),
+
   /** Save today's chanting round count; returns the recomputed dashboard. */
   saveChant: (roundsCompleted: number) =>
     call<SadhnaDashboard>("/sadhna/chant", {
       method: "POST",
       body: JSON.stringify({ rounds_completed: roundsCompleted }),
     }),
+
+  /** The user's collected gifts (newest first) + giftable catalog size. */
+  rewards: () =>
+    call<{ collected: SadhnaRewardGrant[]; total: number }>("/sadhna/rewards"),
+
+  /** Acknowledge pending celebrations after showing the confetti. */
+  ackRewards: () => call<void>("/sadhna/rewards/ack", { method: "POST" }),
+
+  /** Whether daily sādhana reminders are enabled for the caller. */
+  reminderPrefs: () => call<{ enabled: boolean }>("/sadhna/reminders"),
+
+  /** Toggle daily sādhana reminders. */
+  setReminderPrefs: (enabled: boolean) =>
+    call<{ enabled: boolean }>("/sadhna/reminders", {
+      method: "PUT",
+      body: JSON.stringify({ enabled }),
+    }),
+
+  /** Report the browser's IANA timezone so reminders fire at local time. */
+  setTimezone: (timezone: string) =>
+    call<void>("/sadhna/timezone", {
+      method: "POST",
+      body: JSON.stringify({ timezone }),
+    }),
 };